Definition of ludicrous adjective from the Oxford Advanced Learner's Dictionary

 

ludicrous

 adjective
adjective
BrE BrE//ˈluːdɪkrəs//
 
; NAmE NAmE//ˈluːdɪkrəs//
 
 
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unreasonable; that you cannot take seriously synonym absurd, ridiculous a ludicrous suggestion It was ludicrous to think that the plan could succeed. He is paid a ludicrous amount of money. Word Origin early 17th cent. (in the sense ‘sportive, intended as a jest’): from Latin ludicrus (probably from ludicrum ‘stage play’) + -ous.Extra examples The whole idea is absolutely ludicrous! It was ludicrous to think that the plan might succeed. That’s a ludicrous suggestion! These allegations are absolutely ludicrous. This is ludicrous! Of course no one’s going to murder you!
See the Oxford Advanced American Dictionary entry: ludicrous